2822bae168
Tools often need to associate errors not with a single position, but with a span of source code. For example, gopls currently estimates diagnostic spans using heuristics to expand the positions reported by the type checker to surrounding source code. Unfortunately this is often inaccurate. This CL lays the groundwork to solve this within go/types by adding a start and end position to type checker errors. This is an experimental API, both because we are uncertain of the ideal representation for these spans and because their initial positioning is naive. In most cases this CL simply expands errors to the surrounding ast.Node being typechecked, if available. This might not be the best error span to present to the user. For these reasons the API is unexported -- gopls can read these positions using reflection, allowing us to gain experience and improve them during the next development cycle. For golang/go#42290 Change-Id: I39a04d70ea2bb2134b4d4c937f32b2ddb4456430 Reviewed-on: https://go-review.googlesource.com/c/go/+/265250 Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> Trust: Robert Findley <rfindley@google.com> Trust: Robert Griesemer <gri@golang.org> |
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